Method for manufacturing a combined member including a process of fitting a convex portion and a concave portion

Abstract

A manufacturing method of a combination member includes a step of disposing a coating agent capable of being discharged to the outside after a second member is assembled to a first member on a side surface of a protruding portion of the first member and a side surface of a recessed portion of the second member. The manufacturing method includes a step of fitting the protruding portion and the recessed portion to assemble and fix the second member with respect to the first member. The manufacturing method includes a step of discharging the coating agent disposed between the side surface of the protruding portion and the side surface of the recessed portion to the outside to form a gap portion between the protruding portion and the recessed portion.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a combined component including a process of fitting protrusions and recesses together. Background Technology

[0002] In the manufacturing method of the device, sometimes one component is fixed to another after positioning the other component relative to the first. Furthermore, in the case of positioning two components, it is known to form a protrusion in one component and a recess in the other. By inserting the protrusion into the recess, positioning the other component relative to the first component becomes easy. That is, a convex-concave fitting structure is known. For example, when the two components rotate about a rotation axis, a protrusion and a recess extending along the rotation axis are formed. Then, by fitting the protrusion of one component into the recess of the other component, positioning the two components becomes easy.

[0003] In the prior art, it is known to form a diamond-like film on the surface of the concave portion and the surface of the convex portion to reduce friction when the convex portion is inserted into the concave portion (e.g., Japanese Patent Application Publication No. 2006-247756 and Japanese Patent Application Publication No. 2017-63070).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2006-247756

[0007] Patent Document 2: Japanese Patent Application Publication No. 2017-63070 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] When positioning components by forming a protrusion in one component and a recess in another, accurate positioning is impossible if a gap exists between the protrusion and the recess. For accurate positioning, it is preferable that the protrusion and the recess fit together with high precision. That is, it is preferable that the size of the protrusion and the recess be formed such that they fit together tightly. On the other hand, when the protrusion and the recess fit together, it is sometimes difficult to insert them coaxially, making proper fitting difficult.

[0010] To facilitate the engagement of the protrusion with respect to the concave portion, wedge-shaped chamfers can be provided at the corners of the top surface of the protrusion and the top corners of the concave portion. By providing these chamfers, the concave and convex portions can be easily engaged. However, when inserting the protrusion into the concave portion along the wedge shape, the protrusion is sometimes inserted at an angle. Consequently, sometimes the two components are fixed together with the protrusion angled relative to the concave portion. As a result, the two components are fixed together with unwanted forces acting on each component. Thus, due to the forces remaining inside the components, this can sometimes adversely affect the device comprising the components or the device connected to the components.

[0011] Solution for solving the problem

[0012] One disclosed technical solution is a manufacturing method for a composite component by fitting a protrusion of a first component and a recess of a second component together. The protrusion and recess have similar shapes and sizes such that a gap is formed between the sides of the protrusion and the recess when the protrusion is fitted into the recess. The manufacturing method includes: a placement step, in which a protective agent, capable of being released to the outside after the second component is assembled to the first component, is disposed on at least one of the sides of the protrusion and the recess. The manufacturing method includes: a fitting step, in which the protrusion and recess are fitted together, and the second component is assembled relative to the first component; and a fixing step, in which the first component and the second component are fixed to each other using fastening members. The manufacturing method includes: a release step, in which the protective agent disposed between the sides of the protrusion and the recess is released to the outside, thereby forming a gap between the protrusion and the recess.

[0013] The effects of the invention

[0014] According to a technical solution disclosed herein, a method for manufacturing a combined component having a gap between a convex portion and a concave portion can be provided. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the first assembly component in the embodiment.

[0016] Figure 2 This is an exploded perspective view of the first assembly component in the implementation method.

[0017] Figure 3 This is a top view of the first and second components of the embodiment arranged sideways.

[0018] Figure 4 This is a cross-sectional view of the first and second components during the fitting process in the manufacturing method of composite components.

[0019] Figure 5 This is an enlarged sectional view of the first and second components during the fitting process.

[0020] Figure 6 These are cross-sectional views of the first and second components during the fitting and fixing processes.

[0021] Figure 7 This is a cross-sectional view illustrating the fitting process of the manufacturing method of the composite component in the comparative example.

[0022] Figure 8 This is an enlarged sectional view illustrating the fitting process of the manufacturing method of the composite component in the comparative example.

[0023] Figure 9 This is an enlarged sectional view of the second assembly member having a connecting hole that communicates with the gap.

[0024] Figure 10 This is a top view of the first component of the combined component in the first variation example.

[0025] Figure 11 This is a top view of the first component of the combined component in the second variation.

[0026] Figure 12 This is a top view of the first component of the combined component in the third variation. Detailed Implementation

[0027] Reference Figures 1 to 12 The manufacturing method of the combined component according to the embodiment will be described. The combined component is manufactured by combining multiple components. In this embodiment, the combined component is formed by combining a first component having a protrusion and a second component having a recess and fixing them together with a fastening member. At this time, the second component is positioned relative to the first component by fitting the protrusion and the recess. That is, the positioning between the two components is achieved by using a convex-concave fitting structure.

[0028] exist Figure 1 An enlarged cross-sectional view of the first assembly component of this embodiment is shown. Figure 2 An exploded perspective view of the first assembled component of this embodiment is shown. (Refer to...) Figure 1 and Figure 2 The first assembly 1 includes a first component 11 and a second component 21. The first component 11 and the second component 21 are fixed to each other by bolts 71, which serve as fastening members. As fastening members, bolts are not limited to bolts, and any member that can fix the first component 11 and the second component 21 together can be used.

[0029] The first component 11 includes a circular plate-shaped portion 11a and a protrusion 11b protruding from the surface of the plate-shaped portion 11a. A hole 11c for fixing with a bolt 71 is formed in the first component 11. The second component 21 has a circular plate-shaped portion 21a. A recess 21b recessed from the surface is formed in the plate-shaped portion 21a. A hole 21c for the bolt 71 to pass through is formed in the second component 21.

[0030] The convex portion 11b and the concave portion 21b have similar shapes to each other. In particular, the side surfaces of the convex portion 11b and the side surfaces of the concave portion 21b have similar shapes to each other. In this example, the convex portion 11b and the concave portion 21b have cylindrical shapes to each other. The concave portion 21b is formed to be larger than the convex portion 11b. The convex portion 11b and the concave portion 21b have a gap 81 formed between the side surfaces of the convex portion 11b and the side surfaces of the concave portion 21b.

[0031] Reference Figure 1 and Figure 2 In the manufacturing method of the combined component in this embodiment, as shown by arrow 91, the second component 21 is moved relative to the first component 11, thereby engaging the protrusion 11b and the recess 21b. Then, as shown by arrow 92, a bolt 71 is inserted into the hole 21c of the second component 21 and the hole 11c of the first component 11. Thus, the second component 21 is fixed relative to the first component 11 using the bolt 71.

[0032] exist Figure 3 The diagram shows a top view of the first and second components arranged laterally. The planar circular shape of the protrusion 11b of the first component 11 has a diameter D1. That is, the outer diameter of the protrusion 11b is D1. The planar circular shape of the recess 21b of the second component 21 has a diameter D2. That is, the inner diameter of the recess 21b is D2. The diameter D2 is larger than the diameter D1, forming a gap 81 between the protrusion 11b and the recess 21b. Half the difference between diameters D1 and D2, i.e., the radius difference Δr ((D2-D1) / 2), corresponds to the width of the gap 81. Furthermore, the difference Δr corresponds to the thickness of the coating agent, which is configured as a protective agent and will be described later.

[0033] Reference Figures 1 to 3 The composite member 1 is a member that rotates about the rotation axis 86. In this embodiment, it is fixed such that the rotation axis 86 passes through the center of the circle of the planar shape of the protrusion 11b and the center of the circle of the planar shape of the recess 21b. In this way, the first member 11 and the second member 21 are fixed to each other in such a way that the position of the second member 21 is determined relative to the first member 11. In particular, the first member 11 and the second member 21 are fixed to each other in such a way that the first member 11 and the second member 21 are positioned relative to the rotation axis 86.

[0034] In the manufacturing method of the composite component 1, an operator performs a preparation step to manufacture the first component 11 and the second component 21. At this time, the first component 11 and the second component 21 are formed in a manner that gives the surfaces of the protrusion 11b and the recess 21b similar shapes. In this example, the protrusion 11b and the recess 21b are formed into cylindrical shapes. Alternatively, one of the height of the protrusion 11b and the depth of the recess 21b may be greater than the other. Or, the height of the protrusion 11b and the depth of the recess 21b may be the same.

[0035] The convex portion 11b and the concave portion 21b are formed such that the difference Δr between their planar radii is larger than the difference when the convex portion and the concave portion are fitted together with a normal clearance fit. In the case of a normal clearance fit, the convex portion and the concave portion are formed such that half of the difference between the outer diameter of the convex portion and the inner diameter of the concave portion is, for example, 0.035 mm or less. In contrast, in the assembly member 1 of this embodiment, the convex portion 11b and the concave portion 21b can be formed such that half of the difference between diameter D1 and diameter D2 is, for example, 0.05 mm or more and 0.15 mm or less. By providing such a difference, a gap 81 can be formed between the side surface of the convex portion 11b and the side surface of the concave portion 21b when the convex portion 11b is fitted into the concave portion 21b.

[0036] exist Figure 4 A cross-sectional view is shown to illustrate the preparation process of the protective agent according to this embodiment. Figure 5 The image shows an enlarged sectional view of the side of the protrusion of the first component and the side of the concave portion of the second component during the configuration process. (Refer to...) Figure 4 and Figure 5 The operator applies a coating agent 61, acting as a protective agent, to the sides of the protrusion 11b of the first component 11 and the sides of the recess 21b of the second component 21 at a predetermined thickness. The coating agent 61 functions to protect the sides of the protrusion 11b and the recess 21b during the manufacturing process. The coating agent 61 can be a coating agent with the following characteristics: it can be released to the outside and disappear from the gap 81 after the second component 21 is assembled to the first component 11. Here, the coating agent 61 uses a coating agent with the following characteristics: it forms a film by being applied to at least one of the sides of the protrusion and the recess, and it becomes a gas upon heating. For example, a room-temperature fluoropolymer coating agent can be used as this coating agent. This coating agent has a low boiling point and is applied at room temperature. Furthermore, it has the characteristic of becoming a gas upon heating.

[0037] The thickness of the coating agent 61 disposed on the side surfaces of the recess 21b and the convex surface 11b is determined in such a way as to fill the gap 81 of the composite member 1. In this example, the thickness of the coating agent 61 is determined such that the sum of the thickness of the coating agent 61 disposed on the side surface of the convex surface 11b and the thickness of the coating agent 61 disposed on the side surface of the recess 21b is the difference Δr between the radius of the convex surface 11b and the radius of the recess 21b. For example, the coating agent 61 is disposed on the side surfaces of the recess 21b and the convex surface 11b with a thickness of Δr / 2.

[0038] The coating agent 61 is disposed at a constant thickness in the circumferential direction. As a method for disposing of the coating agent at a predetermined thickness, a method using a spraying device can be exemplified. In this method, air spraying or ultrasonic spraying is used to blow a mist of the coating agent toward the object, thereby forming a film of a predetermined thickness.

[0039] In this embodiment, the coating agent 61 is applied to both the side surface of the protrusion 11b of the first member 11 and the side surface of the recess 21b of the second member 21, but this configuration is not limited to this. It is possible to apply the protective agent to at least one of the side surfaces of the protrusion and the recess. That is, it is also possible to apply the protective agent to either the side surface of the protrusion or the side surface of the recess. In this case, the thickness of the protective agent is the thickness (Δr) corresponding to the width of the gap 81.

[0040] exist Figure 6 The diagram shows cross-sectional views of the first and second components, illustrating the fitting and fixing processes of the manufacturing method of this embodiment. (Refer to...) Figures 4 to 6 As indicated by arrow 91, the second member 21 is moved relative to the first member 11. A fitting process is performed to assemble the second member 21 relative to the first member 11 by fitting the protrusion 11b and the recess 21b together. Immediately after the fitting process, the gap 81 is filled with a coating agent 61.

[0041] During the fitting process, a coating agent 61 is disposed on the side surfaces of the protrusion 11b and the recess 21b. Since the coating agent 61 is positioned between the protrusion 11b and the recess 21b, it is possible to prevent the protrusion 11b from being inserted at an angle relative to the recess 21b. Furthermore, since the gap 81 is filled with a coating agent 61 of constant thickness, the positioning of the second member 21 relative to the first member 11 can be performed with high precision. In this example, the positioning between the first member 11 and the second member 21 can be performed by arranging the protrusion 11b and the recess 21b coaxially.

[0042] Next, a fixing process is performed to secure the first component 11 and the second component 21 to each other using bolts 71. Bolts 71 are inserted into holes 21c in the second component 21 and holes 11c in the first component 11. By tightening the bolts 71, the position of the second component 21 relative to the first component 11 is fixed.

[0043] Next, a discharge process is performed to release the coating agent 61 disposed between the side surface of the protrusion 11b of the first member 11 and the side surface of the recess 21b of the second member 21 to the outside. By releasing the coating agent 61 to the outside, a gap 81 is formed between the protrusion 11b and the recess 21b. In this example, the coating agent 61 is heated to turn it into a gas.

[0044] In this embodiment, an industrial dryer is used to heat the mating portion between the protrusion 11b and the recess 21b. The coating agent 61 is heated and becomes a gas, which is then released to the outside. The coating agent 61 disappears from the space between the side of the protrusion 11b and the side of the recess 21b. As a result, as... Figure 1 As shown, a gap 81 is formed between the protrusion 11b and the recess 21b.

[0045] Thus, in the manufacturing method of the combined component of this embodiment, the first component and the second component are formed with a size such that a gap is formed between the side surface of the protrusion and the side surface of the concave portion. A protective agent is disposed on the side surface of the protrusion and the side surface of the concave portion with a thickness corresponding to the width of the gap. After the protrusion and the concave portion are fitted together, the first component and the second component are fixed together using a fastening member. Then, by heating the protective agent to release it to the outside, a gap can be formed between the protrusion and the concave portion.

[0046] exist Figure 7 The diagram shows a cross-sectional view illustrating the method of assembling the second component onto the first component in a comparative example. Figure 8 Enlarged sectional views of the first and second components of the comparative example are shown below. (Refer to...) Figure 7 and Figure 8 In the comparative example, the second member 51 is also moved and engaged relative to the first member 41 as indicated by arrow 91. The first member 41 has a plate-like portion 41a, a protrusion 41b, and a hole 41c for bolt fixing. Similarly, the second member 51 has a plate-like portion 51a, a recess 51b, and a hole 51c for bolt penetration.

[0047] The first member 41 has a chamfered portion 41d formed on the top surface of the protrusion 41b. Furthermore, the second member 51 also has a chamfered portion 51d formed on the portion where the recess 51b is formed. Thus, the chamfered portions 41d and 51d are formed in a manner that prevents the corners from becoming sharp. In the comparative example of the assembled members, for example, a clearance fit is used.

[0048] In the comparative example of the assembled components, by forming a chamfer at the corner, the components can move along the chamfer, making it easy to fit the recess 51b and the protrusion 41b together. However, during the process of inserting the protrusion 41b into the interior of the recess 51b, the second component 51 sometimes tilts relative to the first component 41. Thus, sometimes the second component 51 is fixed to each other while tilted relative to the first component 41.

[0049] Furthermore, since the side of the recess 51b contacts the side of the protrusion 41b, excessive force may sometimes be applied between the recess 51b and the protrusion 41b. Consequently, they may sometimes be fixed together while excessive force is applied between them. In this case, residual stress may remain inside the first or second member, which may adversely affect the device including the first or second member.

[0050] Reference Figures 4 to 6 In contrast, in the manufacturing method of the combined member 1 of this embodiment, the fitting is performed with a coating agent 61 disposed between the side surface of the recess 21b and the side surface of the protrusion 11b. Therefore, direct contact between the side surface of the recess 21b and the side surface of the protrusion 11b can be avoided. Excessive force or damage can be avoided between the recess 21b and the protrusion 11b.

[0051] Furthermore, since the protective agent is applied with a thickness corresponding to the width of the gap 81, the positioning of the second member 21 relative to the first member 11 can be performed with high precision. In particular, in this embodiment, the positioning of the first member 11 and the second member 21 relative to the rotation axis 86 can be performed with high precision. In addition, it is possible to prevent the second member 21 from being fixed together in a state of tilting relative to the first member 11. It is possible to avoid fixing the second member 21 together in a state of force acting on each member while it is tilted relative to the first member 11. Moreover, in the combined member 1, since the gap 81 is formed between the side of the recess 21b and the side of the protrusion 11b, it is possible to reliably prevent force from acting between the recess 21b and the protrusion 11b. That is, it is possible to prevent stress from remaining inside at least one of the first member 11 and the second member.

[0052] The protective agent of this embodiment has the following characteristics: it forms a film by being disposed on at least one of the sides of the convex portion and the side of the concave portion, and becomes a gas by heating, but is not limited to this form. Alternatively, the protective agent may have the following characteristics: it forms a film by being disposed on at least one of the sides of the convex portion and the side of the concave portion, and becomes a liquid by heating. For example, a powder coating agent using a low-melting-point thermoplastic resin can be used as such a coating agent. As a method for preparing the coating agent to a predetermined thickness, a powder coating method can be used. In this method, a film of a predetermined thickness can be formed by adhering the powdered coating agent to the object and heating it at a high temperature.

[0053] exist Figure 9 The image shows an enlarged cross-sectional view of the second assembly component of this embodiment. In the second assembly component 2, the second component 21 has a communication hole 26 that serves as a communication path connecting the gap 81 to the outside. During the discharge process, heating allows the coating agent 61, which has become a gas or liquid, to be discharged to the outside through the communication hole 26, as indicated by arrow 92. In this way, the coating agent 61 filling the gap 81 can be quickly discharged to the outside through the communication hole 26. Alternatively, the coating agent 61 can be discharged to the outside by using a suction device to suction it through the communication hole 26.

[0054] exist Figure 9 In the example shown, a connecting hole 26 is formed in the second member 21, but the form is not limited to this. A connecting path that connects from the gap to the outside can be formed in at least one of the first member and the second member. Furthermore, the connecting path is not limited to the connecting hole described above, as long as it has a structure that connects from the gap to the outside. For example, a long tube can be inserted into the second member instead of the connecting hole described above.

[0055] In the above-described composite component, the planar shapes of the convex and concave portions are formed as circles, but are not limited to this shape. The planar shapes of the convex and concave portions can take a variety of shapes.

[0056] exist Figure 10 The diagram shows a top view of the first component of a first variation of the combined component of this embodiment. The first component 12 of the first variation has a plate-like portion 12a and a protrusion 12b. The planar shape of the protrusion can be a polygon. For example, a regular polygon can be used as the planar shape of the protrusion. Here, the planar shape of the protrusion 12b is a regular pentagon. Furthermore, in... Figure 10 The planar shape of the recess 22b of the second member is shown by dashed lines. The shape of the recess 22b is similar to that of the protrusion 12b.

[0057] When the planar shapes of the convex and concave portions are both polygonal, a gap of a predetermined width can be formed between the convex and concave portions. The concave portion 22b is formed to be larger than the convex portion 12b. In the manufacturing method of the composite component, the protective agent can be configured such that the difference between the center-to-center distance of the convex portion 12b (indicated by arrow 93) and the center-to-center distance of the concave portion 22b (indicated by arrow 94) corresponds to the thickness of the protective agent.

[0058] exist Figure 11 The diagram shows a top view of the first member of a second variation of the combined member according to this embodiment. The first member 13 of the second variation has a plate-like portion 13a and a protrusion 13b. The planar shape of the protrusion 13b is formed as a star. Furthermore, the recess 23b of the second member is shown by dashed lines. The recess 23b of the second member has a shape similar to the protrusion 13b of the first member 13. The protrusion 13b and the recess 23b are formed in such a way that a gap of predetermined width is formed. In the manufacturing method of the combined member, a protective agent of a thickness that fills the space between the protrusion 13b and the recess 23b can be provided. In both the first and second variations, the rotation axis 86 can be positioned such that it passes through the center of gravity of the planar shapes of the protrusion and the recess.

[0059] exist Figure 12 The diagram shows a top view of the first component of a third variation of the combined component of this embodiment. The first component 14 of the third variation has a plate-like portion 14a and a protrusion 14b. The planar shape of the protrusion 14b is irregular. Furthermore, a recess 24b of the second component is shown by dashed lines. The recess 24b of the second component has a shape similar to the protrusion 14b of the first component 14. The protrusion 14b and the recess 24b are formed in such a way that they form a gap of a predetermined width. In the manufacturing method, a protective agent of a thickness that fills the space between the protrusion 14b and the recess 24b can be configured.

[0060] like Figure 11 and Figure 12 As shown, protrusions and recesses with planar shapes other than circles and polygons can also be formed. The manufacturing method of this embodiment can be applied to composite components with similar shapes for the protrusions and recesses.

[0061] In the above-described embodiments, the convex and concave portions are formed such that their cross-sectional shapes remain constant when cut with a plane perpendicular to the axial direction. For example, the convex portion 11b of the first member 11 is formed into a cylindrical shape, but it is not limited to this shape. As long as the convex and concave portions have similar shapes to each other. For example, the cross-sectional shapes of the convex and concave portions when cut with a plane parallel to the axial direction may also be formed into a conical shape. For example, the convex and concave portions may also be formed into a frustum or a cone shape.

[0062] In the above manufacturing method, the sequence of processes can be appropriately changed within the scope of unchanged function and effect.

[0063] The above-described embodiments can be appropriately combined. In the various figures described above, the same or equivalent parts are labeled with the same reference numerals. Furthermore, the above-described embodiments are illustrative and not intended to limit the invention. Additionally, the embodiments include modifications to the embodiments shown in the claims.

[0064] Explanation of reference numerals in the attached figures

[0065] 1, 2, combined components; 11-14, first component; 11b-14b, protrusion; 21, second component; 21b-24b, recess; 26, connecting hole; 61, coating agent; 71, bolt; 81, gap.

Claims

1. A manufacturing method of a combined member that manufactures a combined member by fitting a male portion of a first member and a female portion of a second member, wherein the male portion and the female portion have similar shapes to each other and have sizes such that, when the male portion is fitted in the female portion, a gap portion is formed between a side surface of the male portion and a side surface of the female portion, the manufacturing method of the combined member comprises: a disposing step of disposing a protective agent that can be discharged to the outside after the second member is assembled to the first member, in at least one of the side surface of the male portion and the side surface of the female portion; a fitting step of fitting the male portion and the female portion to assemble the second member to the first member; a fixing step of fixing the first member and the second member to each other by a fastening member; and a discharging step of discharging the protective agent disposed between the side surface of the male portion and the side surface of the female portion to the outside to form the gap portion between the male portion and the female portion.

2. The manufacturing method of the combined member according to claim 1, wherein the protective agent has properties of forming a coating film by being disposed in at least one of the side surface of the male portion and the side surface of the female portion and becoming a gas by heating, and the discharging step includes a step of discharging the protective agent to the outside by heating the protective agent.

3. The manufacturing method of the combined member according to claim 1, wherein the protective agent has properties of forming a coating film by being disposed in at least one of the side surface of the male portion and the side surface of the female portion and becoming a liquid by heating, and the discharging step includes a step of discharging the protective agent to the outside by heating the protective agent.

4. The manufacturing method of the combined member according to any one of claims 1 to 3, wherein at least one of the first member and the second member has a communication path that communicates from the gap portion to the outside, and the discharging step includes a step of discharging the protective agent to the outside via the communication path. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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